1. Intermediate MySQL Administration Sheeri Cabral Senior DB Admin/Architect, Mozilla @sheeri www.sheeri.com http://bit.ly/intMySQLadmin

2. Plan to Fail “If you don't plan to fail, you fail to plan” Practice failover/switchover Offline maintenance

3. Get Ridiculous...and what happens if the data center fails?...if the entire backend network fails?...it's like load testing...somewhere there is a failure (SPOF)

4. Hardware 64-bit RAM – working data set I/O

5. RAID http://www.flickr.com/photos/tirrell/128638167/

6. RAID note Battery-backed write cache – performance – safety

7. SSDs A valid choice Realize your assumptions – Log files & spinning disks Reliable – Power-loss data protection Benchmark

8. Partitions /tmp and ramdisk If this fills, what happens? Data vs. logs vs. backups LVM across >1 partition

9. OS Tuning (Linux) swappiness open files Linux 2.6 kernel – I/O scheduler – Test what works best for you Other daemons

10. Replication Depends on binary logging Two threads – IO thread – SQL thread ignore

11. Monitoring Only alert on what you can fix Graph the important stuff As close to the user experience as possible

12. Backups Have them Test restore Hot, cold, physical, logical – Mix and match!

13. Pro Tips \G – mysql –auto-vertical-output (5.5 and up) \P \c Workbench

14. Built-in Tools Stored procedures/functions – SQL with loops, conditionals, cursors Views Events Partitioning for defragmentation

15. Percona Toolkit Data integrity Ease of finding information (show grants) Query digest/review Other less proven tools

16. Openark Toolkit Online schema change Block accounts Kill slow queries Repeat query execution Security audit – accounts, privs...and more

17. Securich For ease of user administration Clone user Block user Roles

18. Users user@host is unique – not user Super_priv

19. Locking Table vs. Row MyISAM vs. InnoDB deadlocks

20. Buffering Filesystem buffer – Use direct I/O – Bypass fs buffer – Relies on daemon to provide buffering

21. Configuration A note on _ vs - a-variable-with-more-than-one-word vs. a_variable_with_more_than_one_word MySQL tries to be helpful group=mysql group_concat_max_len

22. Configuration Variables datadir tmpdir default_storage_engine='InnoDB' concurrent_insert=2 character_set_server=utf8

23. Gotchas skip_name_resolve innodb_file_per_table tmp_table_size vs. max_heap_table_size

24. InnoDB Parameters innodb_buffer_pool_size innodb_flush_method innodb_flush_logs_at_trx_commit

25. Logging log_warnings log_error expire_logs_days

26. Logging log_slave_updates log_slow_slave_statements log_slow_admin_statements

27. Logging long_query_time log_queries_not_using_indexes min_examined_row_limit

28. max_ max_connections max_connect_errors max_allowed_packet

29. MySQL Query Cache query_cache_size query_cache_type Tuning assistant: http://dom.as/tech/query-cache-tuner/

30. Caches table_open_cache – file descriptors table_definition_cache thread_cache_size

31. Timeouts wait_timeout interactive_timeout

32. Questions? Comments? MySQL Administrator's Bible - tinyurl.com/mysqlbible kimtag.com/mysql planet.mysql.com